class_docstr: Implementation of https://arxiv.org/pdf/1801.07698.pdf
code: def init_margin(self):
      pass
  
file_path: pytorch-metric-learning/src/pytorch_metric_learning/losses/cosface_loss.py
imports: import torch
  from ..utils import common_functions
  from .large_margin_softmax_loss import LargeMarginSoftmaxLoss
label_desc: Use image node_id 2 for calling the CosFaceLoss obj's underlying member method code with example usage: obj.init_margin() without return types